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Significant accounting policies - Intangible assets (Details) - item | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Service connection or habilitation costs |  |  |  |
Significant accounting policies |  |  |  |
Average period for amortization |  |  | 8 years |
3G/4G licenses |  |  |  |
Significant accounting policies |  |  |  |
Average period for amortization |  |  | 180 months |
Grant period for licenses |  |  | 15 years |
PCS license (Paraguay) |  |  |  |
Significant accounting policies |  |  |  |
Average period for amortization |  |  | 60 months |
Renewed period of the licenses |  |  | 5 years |
Temporary extension period | 90 days |  |  |
Number of license extensions available | 1 |  |  |
Internet and data transmission license (Paraguay) |  |  |  |
Significant accounting policies |  |  |  |
Average period for amortization |  |  |  | 60 months
Rights of use |  |  |  |
Significant accounting policies |  |  |  |
Average period for amortization |  |  | 180 months |
Customer relationships | Cubecorp |  |  |  |
Significant accounting policies |  |  |  |
Average period for amortization |  |  | 180 months |
Customer relationships | Tuves Paraguay |  |  |  |
Significant accounting policies |  |  |  |
Average period for amortization |  |  | 78 months |
83/14 | Personal | 3G/4G licenses |  |  |  |
Significant accounting policies |  |  |  |
Remaining useful life of frequencies |  | 15 years |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The grant period for licenses for intangible assets other than goodwill, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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